Commento allows you to foster discussion on your website – if you have a blog, you can embed Commento if you want your readers to add comments. It's fast and bloat-free, has a modern interface, and is reasonably secure. Unlike most alternatives, Commento is lightweight and privacy-focused; I'll never sell your data, show ads, embed third-party tracking scripts, or inject affiliate links.

Remark42 is a self-hosted, lightweight, and simple (yet functional) commenting system, which doesn't spy on users. It can be embedded into blogs, articles or any other place where readers add comments.

A flexible and powerful static content management system for building complex and beautiful websites out of flat files — for people who do not want to make a compromise between a CMS and a static blog engine